def _test(y_pred, y, batch_size):
def update_fn(engine, batch):
idx = (engine.state.iteration - 1) * batch_size
y_true_batch = np_y[idx:idx + batch_size]
y_pred_batch = np_y_pred[idx:idx + batch_size]
return torch.from_numpy(y_pred_batch), torch.from_numpy(
y_true_batch)
engine = Engine(update_fn)
m = FractionalAbsoluteError()
m.attach(engine, "fab")
np_y = y.numpy()
np_y_pred = y_pred.numpy()
data = list(range(y_pred.shape[0] // batch_size))
fab = engine.run(data, max_epochs=1).metrics["fab"]
np_sum = (2 * np.abs(
(np_y_pred - np_y)) / (np.abs(np_y_pred) + np.abs(np_y))).sum()
np_len = len(y_pred)
np_ans = np_sum / np_len
assert np_ans == pytest.approx(fab)
def _test(n_epochs, metric_device):
metric_device = torch.device(metric_device)
n_iters = 80
s = 16
n_classes = 2
offset = n_iters * s
y_true = torch.rand(size=(offset *
idist.get_world_size(), )).to(device)
y_preds = torch.rand(size=(offset *
idist.get_world_size(), )).to(device)
def update(engine, i):
return (
y_preds[i * s + rank * offset:(i + 1) * s + rank * offset],
y_true[i * s + rank * offset:(i + 1) * s + rank * offset],
)
engine = Engine(update)
fae = FractionalAbsoluteError(device=metric_device)
fae.attach(engine, "fae")
data = list(range(n_iters))
engine.run(data=data, max_epochs=n_epochs)
assert "fae" in engine.state.metrics
res = engine.state.metrics["fae"]
if isinstance(res, torch.Tensor):
res = res.cpu().numpy()
np_y = y_true.cpu().numpy()
np_y_pred = y_preds.cpu().numpy()
np_sum = (2 * np.abs(
(np_y_pred - np_y)) / (np.abs(np_y_pred) + np.abs(np_y))).sum()
np_len = len(np_y_pred)
np_ans = np_sum / np_len
assert pytest.approx(res) == np_ans